Powder composition for coating

 

(57) Abstract:

Powder composition for coating relating to paints, varnishes and lacquers, designed to produce protective and decorative coatings on nonmetallic substrates in construction and in everyday life, for internal painting of buildings and structures of brick, concrete, plaster, wood and other porous surfaces. Powder composition includes a binder is a complex polyester obtained on the basis of dichlorohydrin isophthalic acid and Laprol taken in the ratio of 1.0: 1.0 to 1.0 to: 1,2 (in equivalents), titanium dioxide, silicon dioxide, dolomite, sodium polyphosphate, OP-7, polyvinyl alcohol, gramos 402 and p ester of stearic acid. The combination of components in a certain ratio, we can get frost-resistant powder coating with satisfactory adhesion and hardness. table 2.

The invention relates to paint compositions, in particular to powder redispersible compositions, intended for the production of protective and decorative coatings on nonmetallic substrates, as well as for internal painting of buildings and structures of brick, concrete, plaster, wood and other porous surfaces.

Known closest to the technical essence and selected for the prototype powder paint containing as a binder a polyester resin, with the following content, wt.% [CCCP, ed. the certificate in 734238, CL 09 D 5/03, 1980]:

Saturated polyester resin - 60-80

Thermosetting acrylic copolymer of 0.4 to 6.0

Hardener - 3-10

Surfactant - 0,2-3,0

Pigments and fillers - Rest

However, this paint has a number of disadvantages:

- a relatively high temperature (about 200o(C) for the formation of coatings;

- you specialo affects the environment in the shop and adversely affects the health of workers.

Also paint a similar nature has no ability to redispersion, which excludes the possibility of its use as a dry mixture in construction.

The objective of the invention is to provide a dry paint capable of redispersion in water immediately prior to use (i.e., redispersible powder coating), coating on the basis of which can be formed at low temperatures (<15C). The term "redispersion" emphasizes special and important property of the synthetic resin: the ability of the dried dispersion re dispergirujutsja in water.

In this case:

- there is no need to transport water transport and storage is cheaper);

- simple and cheaper packaging - paper bags (simplified disposal containers);

- storage and transport is possible even in extremely adverse climatic conditions (e.g. frost) without compromising the quality of the paint;

- easy preparation of paint on site by mixing the dry mixture in water (paint preparation necessary for the number);

- does not require special equipment to spray - paint is applied on the surface is s for various construction works, for example, for walls and ceilings of buildings in brick, concrete, plaster, wood and other porous surfaces [Lutz, Powder polymers for modification of dry building paints. Coatings and their applications, 1997, 2, S. 26-27].

The task of the invention is achieved in that a powder composition for coating contains a binder, which is a complex polyester obtained on the basis of dichlorohydrin isophthalic acid and Laprol taken in the ratio (in equivalents) 1,0:1,0-1,0:1,2 (Laprol - simple oligoesters obtained by anionic polymerization of propylene oxide); as pigment contains titanium dioxide; fillers - silica and dolomite (CaCO3MgCO3); as surfactants - sodium polyphosphate (dispersant), OD-7 (trademark of the manufacturer; is polyoxyethylene ether of alkylphenol) (emulsifier, wetting agent), polyvinyl alcohol (stabilizer), gramos 402 (trademark of the manufacturer; is a copolymer of butyl acrylate, methacrylic acid, with glycidylmethacrylate) (thickener), p ester of stearic acid (stabilizer) in the following ratio of components (wt.%):R>
Polyphosphate sodium - 0,25-1,5

OP-7 - 0,5-2,5

Polyvinyl alcohol - 0,15-1,0

Gramos 402 - 1,0-2,5

P ester of stearic acid - 0,1-1,0

Polyester synthesized as follows: in chetyrehosnuju flask equipped with a thermometer, a tube for supplying inert gas and reflux condenser, was placed Laprol. Dichlorohydrin isophthalic acid are dissolved in toluene and the resulting solution was poured to the contents of the reaction vessel. Include a stirrer and lead synthesis at a temperature of 100oTo the degree of completion of reaction ~ 80-90%, which is appreciated by the quantity of evolved hydrogen chloride. Evolved hydrogen chloride catch, either in the absorption vessel with an aqueous solution of alkali, taken in a threefold excess in relation to theoretical amount released during the reaction Hcl or acceptors, such as tributylamine introduced directly into the reaction mass. The resulting solution in toluene, neutralized and washed repeatedly with water, then distilled water-toluene mixture. Characteristics of the binder are shown in table 1.

As Laprol can be used, for example, Laprol brands B, 373, 1052, and others.

Preparation of dry paint and the compensation of the oligomer check on the content of the basic substance (dry residue) and diluted if necessary, up to 30% concentration.

In disolver load (wt.%):

A binder is a complex polyester obtained on the basis of dichlorohydrin isophthalic acid and lapola brand B - 15

Titanium dioxide - 20

Silicon dioxide - 10

Dolomite - 53

Polyphosphate sodium - 0,25

OP-7 - 0,5

Polyvinyl alcohol - 0,15

Gramos 402 - 1,0

P ester of stearic acid and 0.1

The dispersion is carried out to achieve the degree of dispersion of 38 to 40 μm, which is controlled by the method of the wedge. After dispersion, the solvent is removed from the resulting product is subjected to the dry mixture to grinding.

The resulting powder is the required form of the "dry" paint.

Getting ready to use paint material is carried out by adding water to the powder in the ratio of powder:water 1:1-3:4 (by weight) and thorough mixing during the first 60 s, and then after a ten-minute break for another 5 minutes.

The material was applied (by brush, roller, spray gun) on glass, wood, concrete and plastered surfaces. After curing of the coating was evaluated by appearance, adhesion, slavemaster,

Examples 2-6 analogous to example 1. The results tested the ditch, the coatings obtained on the basis of the proposed compositions have satisfactory adhesion and hardness compared to the compositions obtained by the prototype.

Powder form of "dry" paint gives the opportunity to prepare that amount, what is required at the moment. In addition, this paint is very practical due to the fact that in powder form, it does not freeze and frost doesn't affect the quality of the paint. In dry form it does not deteriorate and immediately ready to use after mixing with water. Also the paint does not pollute the environment because it does not contain any preservatives and toxic solvents.

In addition to the positive qualities of the paints listed above, it is necessary to mention its practical packaging (paper bags), because the water is added just before use, which is very convenient and advantageous when transporting.

Powder composition for coating comprising a binder, a pigment, a filler, characterized in that it contains as a binder a complex polyester obtained on the basis of dichlorohydrin isophthalic acid and Laprol taken in the ratio in equivalents 1,0:1,0 - 1,0:1,2, as Pigma sodium, OP-7, polyvinyl alcohol, gramos 402, p ester of stearic acid in the following ratio, wt.%:

Complex polyester - 15-25

Titanium dioxide - 15-20

Silicon dioxide - 6,5-10

Dolomite - 45-53

Polyphosphate sodium - 0,25-1,5

OP-7 - 0,5-2,5

Polyvinyl alcohol - 0,15-1,0

Gramos 402 - 1,0-2,5

P ester of stearic acid is 0.1 to 1.0

 

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